Elevator-brake.



J. ZWEIBACKB ELEVATOR BRAKE, APPLICATION FILED AUG. 11. um.

Patented July 31, 1917.

2 SHEETS-SHEET I J. ZWEIBACK.

ELEVATOR BRAKE.

APPLICATIDN FILED AUG-17, 1914.

1,235,51 3. Patented July 31, 1917.

2 SHEETS-SHEET 2- Hum, I

JOSEPH ZWEIBACK, 0F KIMBERLEY, SOUTH AFRICA.

ELEVATOR-BRAKE.

Specification of Letters Patent.

Patented July 31, 1917.

Application filed August 17, 1914. Serial No. 857,244.

To all whom it may concern:

Be it known that I, JosnPH ZWEIBAGK, a subject of the King of GreatBritain, residing at Kimberley, Cape Province, and Union of SouthAfrica, have invented certain new and useful Improvements in Elevator-Brakes, of which the following is a specification.

The object of my invention is to provide an elevator brake the parts ofwhich are so constructed and arranged that as the elevator carapproaches either of its extreme points of travel, the brake is appliedto stop the travel of the car and the car is held against movement ineither direction.

A further object is to so construct the parts of the brake that thisbrake may be set either automatically or manually and when once setautomatically cannot be released eXcept by manual manipulation.

With other objects in view, which will be referred to, my inventionconsists in the peculiar combination and novel arrangement of parts,such as will be hereinafter more fully described in connection with theaccompanying drawings and more particularly pointed out in the appendedclaims.

In the drawings Figure 1 is a view in side elevation showing the carapproaching one of its extremities of travel and illustrating therelative positioning of the parts.

Fig. 2 is a view in elevation of the brake mechanism with parts brokenaway more clearly to illustrate the structure.

Fi 3 is a vertical sectional view on the line 5-3 of Fig. 1 through oneof the car guides.

Fig. 4 is a view in elevation with parts in section to illustrate amodified form of brake operating means.

Fig. 5 is a detail view of the brake actuating means connected on thecar.

The elevator car 1 is mounted to travel between guides 2, only one ofwhich is shown in the disclosure in Fig. 1, and shoes 3 are provided tohold the car in the proper relation with respect to the guides 2. Acable 4t is provided to move the car 1 up and down in the shaft, thiscable extends up over a sheave 5 and is then brought down and around tobe wrapped around a drum 6 mounted on the power shaft 7 which shaft mayderive its power from any suitable source as for instance by belt orgearing from a steam engine, motor or other power transmission means.

The shaft 7 in addition to the cable drum 6, has a brake wheel 8 rigidlysecured thereon and this shaft is mounted to turn in the bearing 9provided on the base 10. A brake lever 11 is pivotally mounted on asupport 12 provided on the base 10 and a brake band 13 is connected atone end with the standard 12 and at its opposite end with the lever 11so that as the lever is swung in a downward direction the brake band istightened around the brake wheel 8 and through its frictional contactwith the surface of this wheel the rotation of the shaft 7 will bestopped. A spring 14 is provided to normally hold the brake lever 11 ata position that the brake band is loose around brake wheel 8 and theshaft 7 is free to rotate. The brake lever 11 is provided with a catch15 and a latch 16 is pivotally connected on the support 12 and has aweighted hand lever 17 connected therewith in such a manner that as thebrake lever 11 is swung in a downward path to tighten the brake band 13around the brake wheel 8, this latch 16 is swung to a position to engagewith the catch 15 and the brake lever is held'at a position that thebrake band bears against the brake wheel, from which position the partscan be released only by swinging the weighted hand lever 17 to a pointthat the latch 16 is swung out of the path of the catch 15 and thespring let is again permitted to raise the brake lever 11 to release thebrake band 13.

An idler wheel 18 has a shaft 19 pivotally connected with the side ofthe car in such relation that this idler wheel bears and turns againstthe side of one of the guides 2, a spring 20 being provided to bearagainst the shaft 19 and hold the wheel positively in varying contactagainst the guides. The

guide 2 is channeled out on the side against which the idler wheel 18bears and in vertical alinement with this wheel, the channel portionsbeing provided at a point adjacent the position at which the car isstopped in its one extremity of travel. A block 22 is hinged at 23within the channel portions to normally project from the face of theguide 1 as better shown in Fig. 3, so tha it is in the path of travel ofthe wheel 18, and a cable it passes over pulleys 25 and 26 to connectthe swinging end of the block 22 with one of the arms of a bell-cranklever 27 pivoted at its angle on the base 10 of the brake. A secondcable 28 wound over the pulleys 29 and 30 and is connected at its endwith the tree arm of the bell-crank lever 27 and with the brake lever11.

In operation, it is preferable that a block 22 and the mechanismconnected therewith to actuate the brake-operating lever be mounted nearboth extremities of travel of the car and then, in case the engine drivemisjudges the distance which the car has to travel and the power notshut 0d soon enough, if the operator is otherwise engaged when the carshould be stopped, or if for any other reason, power is not shut off atthe proper time, the wheel 18 will bear againstt-he block 22 forcingthis block into the channeledout portion 21 and eX- ert-ing a drawingtension upon the cable 2% to swing the bell-crank lever 27 around itspivotal connection and to draw the brake lever 11 down to a point thatthe brake band 13 is brought into contact with the brake wheel 8 and thelatch 16 engages with the catch 15 of the hand lever. 'With the parts inthis relation, the rotation of the shaft 7 is stopped and the ceasing01": the winding ontov or unwinding from of the cable at with respect tothe cable drum 6 stops the travel of the car, the parts being held inthis position with the car stopped until the bralre lever 11 is manuallymoved from the position with the brake band 13 in frictional contactwith the brake wheel 8.

In the disclosure in Fig. i electrical means is substituted for themechanical means shown in Fig. 1 to bring the brake lever automaticallyto a position that the brake band 13 bears against the brake wheel 8. Inthis disclosure the channel portion :21 has a contact member 31 mountedtherein and a second contact member is mounted on a spring plate 33provided with a block 3% thereon in position to be engaged by the wheel18 as the car moves toward its extremity of travel and to be depressedto a position that the contacts 31 and are brought together. Circuitwires and 36 are connected with the contacts 31 and 32 andleads to asolenoid coil 37 which is positioned adjacent the brake lever 11 and thesolenoid core 38 is mounted on the brake lever in such relation that asthe two contacts are brought together and the coil is energized thiscore will be drawn into the coil and the brake lever will be swungdownwardly around its pivotal connection on the support 12 a sullicientdistance that the brake band will be brought into frictional contactwith the brake wheel and the parts will be locked in this relation, abattery or other suitable source of electrical energy 39 being providedin the circuit wires 35 and 36 to energize the coil as the contacts arebrought together.

From the foregoing it will be seen that I have provided a brake whichautomatically and positively stops the travel of the elevator car. whenit has reached its extremity of up or down movement.

While I haveherein shown and described only specific forms of invention,it will be understood that slight changes might be made in the form andarrangement of the several parts without departing from the spirit andscope of my invention, and hence I do not wish to be limited theretoexcept for such limitations as the claims may import.

I claim 1. An elevator car brake comprising a brake wheel to control thetravel of the car, a brake band received about said brake wheel, asupport in proximity to said brake wheel, a brake lever pivotallymounted on said support, one end of said brake band being connected withsaid support and the other end of said brake band having connection withsaid brake lever, means associated with said brake lever normallytending to retain said brake band out of frictional contact with saidbrake wheel, means to be actuated by the elevator car at certain timesto cause the setting of said brake level whereby said brake band will bebrought into frictional contact with the brake wheel, and means toautomatically lock said brake lever in a set position, as and for thepurpose specified.

2. An elevator car brake comprising a brakewheel to control the movementof the car, a brake band received about said wheel, a support arrangedin proximity to said brake wheel, said brakeband havingone end attachedto said support, a brake lever pivotally mounted on said support, theother end of said bralre band having connection with said brake lever, aspring to normally retain said brake lever in a position where by saidbrake band may be held out of frictional contact with said brake wheel,a catch on one end of said brake lever, a latch member pivotally mountedon said support, means to be operated by the elevator carat certaintimes to'draw said brake lever to a set position and cause said brakeband to be brought into frictional contact with said brake wheel,whereby said latch member will automatically lock said brake lever in aset In testimony whereof I aflix my signature positlilondbgcooperaftioli with 1slaid. catch, a in presence of two witnesses.

Weig te ever to aci itate t e automatic actuation of said latch member,and said JOSEPH ZWEIBAOK' Weighted lever being manually operable toWitnesses:

unlock said latch, as and for the purpose LEONARD ISAACS,

specified. A. E. ERLANK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

